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26 // -------------------------------------------------------------------
27 //
28 // GEANT4 Class file
29 //
30 //
31 // File name: G4BGGPionInelasticXS
32 //
33 // Author: Vladimir Ivanchenko
34 //
35 // Creation date: 01.10.2003
36 // Modifications:
37 //
38 // -------------------------------------------------------------------
39 //
40
41 #include "G4BGGPionInelasticXS.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4ComponentGGHadronNucleusXsc.hh"
44 #include "G4UPiNuclearCrossSection.hh"
45 #include "G4HadronNucleonXsc.hh"
46 #include "G4NuclearRadii.hh"
47
48 #include "G4Proton.hh"
49 #include "G4PionPlus.hh"
50 #include "G4PionMinus.hh"
51 #include "G4NistManager.hh"
52 #include "G4Pow.hh"
53 #include "G4HadronicParameters.hh"
54
55 G4double G4BGGPionInelasticXS::theGlauberFacPiPlus[93] = {0.0};
56 G4double G4BGGPionInelasticXS::theGlauberFacPiMinus[93] = {0.0};
57 G4double G4BGGPionInelasticXS::theLowEPiPlus[93] = {0.0};
58 G4double G4BGGPionInelasticXS::theLowEPiMinus[93] = {0.0};
59 G4int G4BGGPionInelasticXS::theA[93] = {0};
60
61 G4BGGPionInelasticXS::G4BGGPionInelasticXS(const G4ParticleDefinition* p)
62 : G4VCrossSectionDataSet("BarashenkovGlauberGribov")
63 {
64 verboseLevel = 0;
65 fGlauberEnergy = 91.*CLHEP::GeV;
66 fLowEnergy = 20.*CLHEP::MeV;
67 fLowestEnergy = 1.*CLHEP::MeV;
68 SetMinKinEnergy(0.0);
69 SetMaxKinEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
70
71 fPion = new G4UPiNuclearCrossSection();
72 fGlauber = new G4ComponentGGHadronNucleusXsc();
73 fHadron = new G4HadronNucleonXsc();
74
75 fG4pow = G4Pow::GetInstance();
76
77 theProton = G4Proton::Proton();
78 thePiPlus = G4PionPlus::PionPlus();
79 isPiplus = (p == thePiPlus);
80 SetForAllAtomsAndEnergies(true);
81
82 if (0 == theA[0]) { Initialise(); }
83 }
84
85 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
86
87 G4BGGPionInelasticXS::~G4BGGPionInelasticXS()
88 {
89 delete fHadron;
90 }
91
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93
94 G4bool
95 G4BGGPionInelasticXS::IsElementApplicable(const G4DynamicParticle*, G4int,
96 const G4Material*)
97 {
98 return true;
99 }
100
101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102
103 G4bool G4BGGPionInelasticXS::IsIsoApplicable(const G4DynamicParticle*,
104 G4int Z, G4int,
105 const G4Element*,
106 const G4Material*)
107 {
108 return (1 == Z);
109 }
110
111 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
112
113 G4double
114 G4BGGPionInelasticXS::GetElementCrossSection(const G4DynamicParticle* dp,
115 G4int ZZ, const G4Material*)
116 {
117 // this method should be called only for Z > 1
118
119 G4double cross = 0.0;
120 G4double ekin = std::max(dp->GetKineticEnergy(), fLowestEnergy);
121 G4int Z = std::min(ZZ, 92);
122
123 if(1 == Z) {
124 cross = 1.0115*GetIsoCrossSection(dp,1,1);
125 } else if(ekin < fLowEnergy) {
126 cross = (isPiplus) ? theLowEPiPlus[Z]*CoulombFactorPiPlus(ekin, Z)
127 : theLowEPiMinus[Z]*FactorPiMinus(ekin);
128 } else if(ekin > fGlauberEnergy) {
129 cross = (isPiplus) ? theGlauberFacPiPlus[Z] : theGlauberFacPiMinus[Z];
130 cross *= fGlauber->GetInelasticGlauberGribov(dp, Z, theA[Z]);
131 } else {
132 cross = fPion->GetInelasticCrossSection(dp, Z, theA[Z]);
133 }
134 #ifdef G4VERBOSE
135 if(verboseLevel > 1) {
136 G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
137 << dp->GetDefinition()->GetParticleName()
138 << " Ekin(GeV)= " << dp->GetKineticEnergy()
139 << " in nucleus Z= " << Z << " A= " << theA[Z]
140 << " XS(b)= " << cross/barn
141 << G4endl;
142 }
143 #endif
144 return cross;
145 }
146
147 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
148
149 G4double
150 G4BGGPionInelasticXS::GetIsoCrossSection(const G4DynamicParticle* dp,
151 G4int, G4int A,
152 const G4Isotope*,
153 const G4Element*,
154 const G4Material*)
155 {
156 // this method should be called only for Z = 1
157 fHadron->HadronNucleonXscNS(dp->GetDefinition(), theProton,
158 dp->GetKineticEnergy());
159 G4double cross = A*fHadron->GetInelasticHadronNucleonXsc();
160
161 #ifdef G4VERBOSE
162 if(verboseLevel > 1) {
163 G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
164 << dp->GetDefinition()->GetParticleName()
165 << " Ekin(GeV)= " << dp->GetKineticEnergy()
166 << " in nucleus Z=1 A=" << A
167 << " XS(b)= " << cross/barn
168 << G4endl;
169 }
170 #endif
171 return cross;
172 }
173
174 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
175
176 void G4BGGPionInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
177 {
178 if(verboseLevel > 1) {
179 G4cout << "G4BGGPionInelasticXS::BuildPhysicsTable for "
180 << p.GetParticleName() << G4endl;
181 }
182 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
183 isPiplus = (&p == G4PionPlus::PionPlus());
184 } else {
185 G4ExceptionDescription ed;
186 ed << "This BGG cross section is applicable only to pions and not to "
187 << p.GetParticleName() << G4endl;
188 G4Exception("G4BGGPionInelasticXS::BuildPhysicsTable", "had001",
189 FatalException, ed);
190 }
191 }
192
193 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
194
195 void G4BGGPionInelasticXS::Initialise()
196 {
197 theA[0] = theA[1] = 1;
198 G4ThreeVector mom(0.0,0.0,1.0);
199 G4DynamicParticle dp(thePiPlus, mom, fGlauberEnergy);
200
201 G4NistManager* nist = G4NistManager::Instance();
202 G4double csup, csdn;
203
204 for (G4int iz=2; iz<93; ++iz) {
205 G4int A = G4lrint(nist->GetAtomicMassAmu(iz));
206 theA[iz] = A;
207
208 csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, A);
209 csdn = fPion->GetInelasticCrossSection(&dp, iz, A);
210 theGlauberFacPiPlus[iz] = csdn/csup;
211 }
212
213 dp.SetDefinition(G4PionMinus::PionMinus());
214 for (G4int iz=2; iz<93; ++iz) {
215 csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, theA[iz]);
216 csdn = fPion->GetInelasticCrossSection(&dp, iz, theA[iz]);
217 theGlauberFacPiMinus[iz] = csdn/csup;
218
219 if(verboseLevel > 1) {
220 G4cout << "Z= " << iz << " A= " << theA[iz]
221 << " factorPiPlus= " << theGlauberFacPiPlus[iz]
222 << " factorPiMinus= " << theGlauberFacPiMinus[iz]
223 << G4endl;
224 }
225 }
226
227 theLowEPiPlus[1] = theLowEPiMinus[1]= 1.0;
228 dp.SetDefinition(thePiPlus);
229 dp.SetKineticEnergy(fLowEnergy);
230 for (G4int iz=2; iz<93; ++iz) {
231 theLowEPiPlus[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz])
232 /CoulombFactorPiPlus(fLowEnergy, iz);
233 }
234
235 dp.SetDefinition(G4PionMinus::PionMinus());
236 for (G4int iz=2; iz<93; ++iz) {
237 theLowEPiMinus[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz])
238 /FactorPiMinus(fLowEnergy);
239
240 if (verboseLevel > 1) {
241 G4cout << "Z= " << iz << " A= " << theA[iz]
242 << " LowEtorPiPlus= " << theLowEPiPlus[iz]
243 << " LowEtorPiMinus= " << theLowEPiMinus[iz]
244 << G4endl;
245 }
246 }
247 }
248
249 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
250
251 G4double G4BGGPionInelasticXS::CoulombFactorPiPlus(G4double kinEnergy, G4int Z)
252 {
253 return (kinEnergy > 0.0) ?
254 G4NuclearRadii::CoulombFactor(Z, theA[Z], thePiPlus, kinEnergy) : 0.0;
255 }
256
257 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
258
259 G4double G4BGGPionInelasticXS::FactorPiMinus(G4double kinEnergy)
260 {
261 return 1.0/std::sqrt(kinEnergy);
262 }
263
264 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
265
266 void
267 G4BGGPionInelasticXS::CrossSectionDescription(std::ostream& outFile) const
268 {
269 outFile << "The Barashenkov-Glauber-Gribov cross section handles inelastic\n"
270 << "pion scattering from nuclei at all energies. The Barashenkov\n"
271 << "parameterization is used below 91 GeV and the Glauber-Gribov\n"
272 << "parameterization is used above 91 GeV.\n";
273 }
274
275 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
276